Context.maskSurface
void maskSurface(cairo.surface.Surface surface, double surfaceX, double surfaceY)A drawing operator that paints the current source using the alpha channel of surface as a mask. (Opaque areas of surface are painted with the source, transparent areas are not painted.)
Parameters
surface | a #cairo_surface_t |
surfaceX | X coordinate at which to place the origin of surface |
surfaceY | Y coordinate at which to place the origin of surface |